feat(openttd): Add openttd dedicated server

openttd-server/README.md

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+# OpenTTD-Server
+
+Build the openttd-server dedicated as a static PIE ELF running on Linux.
+
+## Requirements
+Make sure the following packages are installed:
+- build-utils
+- cmake
+- git
+- strip
+
+## Building
+The openttd and openttd_test static PIE files are located in the current directory.
+If you want to rebuild, run:
+
+```bash
+$ ./build.sh
+```
+
+This script downloads, unpacks, patches, configures, and builds the openttd dedicated server PIE ELF file.
+Make sure that you patch out any other libraries that you might have in your system.
+If you want to add a library, add this type of line after the `sed` command:
+
+```
+set(ZLIB_USE_STATIC_LIBS "ON")
+```

openttd-server/build.sh

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+#!/bin/bash
+
+APPNAME=openttd
+DIRNAME=OpenTTD
+URL=https://github.com/OpenTTD/OpenTTD.git
+
+echo -n "Downloading ${APPNAME} sources ..."
+git clone --depth 1 ${URL} --quiet
+echo "DONE"
+
+echo -n "Building ${APPNAME} ..."
+
+pushd ${DIRNAME} > /dev/null 2>&1 || exit 1
+
+mkdir build
+pushd build > /dev/null 2>&1 || exit 1
+
+cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo -DOPTION_DEDICATED=ON -DOPTION_USE_ASSERTS=OFF -DOPTION_USE_THREADS=ON ..
+
+echo "target_compile_options(openttd PUBLIC \"-static-pie\")" >> ../CMakeLists.txt
+echo "target_compile_options(openttd_lib PUBLIC \"-static-pie\")" >> ../CMakeLists.txt
+echo "target_link_options(openttd PUBLIC \"-static-pie\")" >> ../CMakeLists.txt
+echo "target_link_options(openttd_lib PUBLIC \"-static-pie\")" >> ../CMakeLists.txt
+
+sed -i 's/link_package/#link_package/g' ../CMakeLists.txt
+
+make -j$(nproc)
+
+strip openttd
+strip openttd_test
+
+popd > /dev/null 2>&1 || exit 1
+
+popd > /dev/null 2>&1 || exit 1
+